Police said the girl was lured to a wooded area near that intersection and was stabbed 19 times. She suffered wounds to her arm, legs and torso.

Police said the girl was able to crawl out of the woods and make it to the road where she was discovered by a bicyclist.

Jack said she was rushed into surgery and remains in stable condition at Waukesha Memorial Hospital. Medical staff told police she was "1 millimeter from certain death."

He said the girls in question were located in several hours and were taken into custody without incident.

They said the three attend the same middle school and were considered friends.

Waukesha Police Chief Russell Jack said the two girls had an interest in a website "which was a collection of small stories about death and horror."

Waukesha police said the two girls said they believed in a fictional evil character called The Slender Man on creepypasta.com and essentially wanted to be one of his disciples. To do so, they believed, required killing someone.

One of the girls told police she had never met Slenderman but that he watches her, and he can read your mind. She said she sees him in her dreams.

Creepypasta.com issued a statement Tuesday offering condolences to the families involved, and stating that while new stories and comments are not being allowed at this time, the original posts on the site will remain.

"But if I may be so bold, I don’t believe that it’s the fault of Slenderman or horror writing in general that this happened. I remember reading scary stories and watching slasher movies when I was a child and young teenager and while they certainly gave me nightmares, they did not instill within me a desire to murder my friends. For someone to make the jump from reading a creepy story that is – at least on this website, once again, I can’t speak for all creepypasta websites – being presented as 100% fiction into actually using it as a motive to plot and murder another human being – something else has to be going on there."

According to the complaint, the girls lured their friend from one of the suspect's homes, where they met for a birthday slumber party Saturday. Once in the woods, police said they stabbed her throughout her body, including wounds to her heart, liver, pancreas, and stomach and one to her chest that just missed a major artery.

The girls told police they had been planning the stabbing since December. One said, "it just seemed necessary."

The other girl told police "The bad part of me wanted her to die. The good part of me wanted her to live."

One of the girl's attorneys said the next step is getting his client a mental evaluation. He said her family is devastated.

"To say it's every parent's worse nightmare is a cliché but it is. It's the worst nightmare they could ever be dealing with. My client's family feels incredible remorse for what's taken place here," defense attorney Anthony Cotton said.

Jack said if you have children now is the time to see what they're looking at online.

"This should be a wakeup call for parents. Parents are strongly encouraged to monitor their Internet usage,' Jack said.